Question

How to solve 3 2 4 6= 21

Answer 1

I hope
63-42=21
I guess

Answer 2

3+2+6+4=15*15=225

2+2+5=9*2+3=21

4+3+5+2=14*14=196

1+9+6=16*2+6=38

6+3+2+5=16*16=256

2+5+6=13*2+9=35

So the answer =35